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enhancements to range comprehensions, back to being safe -- and usable downwards without a 'by' clause, and optimized when working with integer literals.

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Jeremy Ashkenas
2010-07-17 18:45:29 -04:00
parent 96f076983e
commit 5a34f53689
7 changed files with 88 additions and 53 deletions
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16
test/test_comprehensions.coffee
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@@ -25,14 +25,6 @@ result: nums.concat(negs).join(', ')
ok result is '3, 6, 9, -20, -19, -18'
# Ensure that ranges are safe. This used to infinite loop:
j = 5
result: for j in [j..(j+3)]
j
ok result.join(' ') is '5 6 7 8'
# With range comprehensions, you can loop in steps.
results: x for x in [0..25] by 5
@@ -40,11 +32,17 @@ ok results.join(' ') is '0 5 10 15 20 25'
# And can loop downwards, with a negative step.
results: x for x in [5..1] by -1
results: x for x in [5..1]
ok results.join(' ') is '5 4 3 2 1'
ok results.join(' ') is [(10-5)..(-2+3)].join(' ')
results: x for x in [10..1]
ok results.join(' ') is [10..1].join(' ')
results: x for x in [10...0] by -2
ok results.join(' ') is [10, 8, 6, 4, 2].join(' ')
# Multiline array comprehension with filter.
evens: for num in [1, 2, 3, 4, 5, 6] when num % 2 is 0